Five reasons why we haven’t found aliens yet– As Prof Stephen Hawking and colleagues set out on the biggest alien hunt ever, we take a speculative look at why we haven’t already found any little green men (or extraterrestrial microbes, for that matter).

Hinckley UFO: reader says “I knew instantly it was not of this earth” Colin Saunders has contacted us having read Michael Roberts’ article on a UFO sighting. He tells the story of his own close encounter with the unknown

UFO Sightings are common in this tiny Colorado townHOOPER, Colo. — As part of our new series, “Colorado’s Unexplained Stories,” we’re taking a trip four hours south of Denver to the state’s San Luis Valley. The area is nicknamed “The UFO Hot Spot of America.” Apparently there are more UFO sightings there than anywhere else in America.